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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2012-06-21 23:05:37 +0200 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2012-06-28 23:20:43 +0200 |
| commit | c337d3655ce85e12c7c476cb81406521926cacd2 (patch) | |
| tree | 2d0f0caa7b4f2b3d366ac7a37fc4d2f82b7706c7 | |
| parent | SUNRPC: Don't decode beyond the end of the RPC reply message (diff) | |
| download | linux-c337d3655ce85e12c7c476cb81406521926cacd2.tar.xz linux-c337d3655ce85e12c7c476cb81406521926cacd2.zip | |
SUNRPC: xdr_read_pages should return the amount of XDR encoded page data
Callers of xdr_read_pages() will want to know exactly how much XDR
data is encoded in the pages after the data realignment.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| -rw-r--r-- | include/linux/sunrpc/xdr.h | 2 | ||||
| -rw-r--r-- | net/sunrpc/xdr.c | 9 |
2 files changed, 7 insertions, 4 deletions
diff --git a/include/linux/sunrpc/xdr.h b/include/linux/sunrpc/xdr.h index f1e7f884d1c3..2489bce1fb88 100644 --- a/include/linux/sunrpc/xdr.h +++ b/include/linux/sunrpc/xdr.h @@ -223,7 +223,7 @@ extern void xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf, struct page **pages, unsigned int len); extern void xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen); extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes); -extern void xdr_read_pages(struct xdr_stream *xdr, unsigned int len); +extern unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len); extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len); extern int xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data); diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c index 5643feb6c645..80d518644cf8 100644 --- a/net/sunrpc/xdr.c +++ b/net/sunrpc/xdr.c @@ -745,8 +745,10 @@ EXPORT_SYMBOL_GPL(xdr_inline_decode); * Moves data beyond the current pointer position from the XDR head[] buffer * into the page list. Any data that lies beyond current position + "len" * bytes is moved into the XDR tail[]. + * + * Returns the number of XDR encoded bytes now contained in the pages */ -void xdr_read_pages(struct xdr_stream *xdr, unsigned int len) +unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len) { struct xdr_buf *buf = xdr->buf; struct kvec *iov; @@ -756,7 +758,7 @@ void xdr_read_pages(struct xdr_stream *xdr, unsigned int len) int padding; if (xdr->nwords == 0) - return; + return 0; if (nwords > xdr->nwords) { nwords = xdr->nwords; len = nwords << 2; @@ -787,6 +789,7 @@ void xdr_read_pages(struct xdr_stream *xdr, unsigned int len) xdr->end = (__be32 *)((char *)iov->iov_base + end); xdr->page_ptr = NULL; xdr->nwords = XDR_QUADLEN(end - padding); + return len; } EXPORT_SYMBOL_GPL(xdr_read_pages); @@ -802,7 +805,7 @@ EXPORT_SYMBOL_GPL(xdr_read_pages); */ void xdr_enter_page(struct xdr_stream *xdr, unsigned int len) { - xdr_read_pages(xdr, len); + len = xdr_read_pages(xdr, len); /* * Position current pointer at beginning of tail, and * set remaining message length. |